Fixes to the tests: pymssql, psql, user & group #2542
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based on #2541 - merge the other one first
pymssql there are no wheels for 3.8, needs to be built
install required header files
fixes tests: pymssql (sql output dependency) installation fails #2539
required by tests
maybe it was already installed on github actions by default? we can't
rely on it, better do it explicitly
then it also works on other plattforms, such as act
if the tests already run with an unprivileged user, all is good, but if
running as root, intelmq won't be able to un-privilege itself if there's
no intelmq user